Abstract
In the analysis of power-line networks over a large frequency
span, the time-domain method used in programs like EMTP
(Electromagnetic Time domain Program) can not be used. A more
rigorous analysis method must be employed. The correct analysis
method (assuming TEM-mode propagation) for multiple coupled
transmission line circuits like power line circuits, is based on
finding the eigenvalues and eigenvectors for the matrix ZY, where
Z and Y are the impedance- and admittance matrices for the coupled
lines in W/m and S/m. In this paper a flow-graph representation of
the relations beween voltage- and current-vectors is presented for
a general coupled line circuit. This flow-graph can be used to
find any transfer function on a multiple coupled lossy
transmission line circuit. In some cases, however, it is difficult
to find the eigenvalues correctly. A correct analysis can thus not
be made. An approximate analysis method must be usedIn this paper
it is shown that an eigenvectormatrix, that is the propagation
modes, can be chosen almost arbitrarily if the frequency interval
of interest lies below the frequency, where the line length is
about 1/3 times the wavelength for the propagation mode with the
lowest phase velocity. The propagation constants corresponding to
the chosen eigenvector matrix (the quasi modes) are found
iteratively, which is a much simpler procedure than finding the
eigenvalues.
Original language | English |
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Title of host publication | Proceedings 1997 International Symposium on POWER-LINE COMMUNICATIONS and its APPLICATIONS |
Place of Publication | Essen |
Publisher | University of Essen |
Publication date | 1997 |
Publication status | Published - 1997 |
Event | International Symposium on Power Line Communications and
its Applications. April 2 - 4 1997. - Essen, Germany. Duration: 1 Jan 1997 → … |
Conference
Conference | International Symposium on Power Line Communications and its Applications. April 2 - 4 1997. |
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City | Essen, Germany. |
Period | 01/01/1997 → … |